#ifndef ZCONFIG_H_
#define ZCONFIG_H_

#include "../Common/GlobalDefines.h"
#include <string>
#include <map>
#include <iostream>
#include <fstream>
#include <sstream>

GLOBAL_NAMESPACE_BEGIN

class Config
{
private:
    std::string delimiter_;     //!< separator between key and value
    std::string comment_;       //!< separator between value and comments
    std::map<std::string, std::string> contents_; //!< extracted keys and values

    typedef std::map<std::string, std::string>::iterator mapI;
    typedef std::map<std::string, std::string>::const_iterator mapCI;

public:
    Config(std::string fileName, std::string delimiter = "=", std::string comment = "#");
    Config();

    template<class T> T read(const std::string& in_key) const; //!<Search for key and read value or optional default value, call as read<T>
    template<class T> T read(const std::string& in_key, const T& in_value) const;
    template<class T> bool isReadInto( T& out_var, const std::string& in_key ) const;
    template<class T> bool isReadInto( T& out_var, const std::string& in_key, const T& in_value ) const;
    bool isFileExist(std::string filename);
    void readFile(std::string filename,std::string delimiter = "=",std::string comment = "#" );
    void writeFile(std::string filename);

    // Check whether key exists in configuration  
    bool isKeyExists( const std::string& in_key ) const;

    // Modify keys and values  
    template<class T> void add( const std::string& in_key, const T& in_value );
    void remove( const std::string& in_key );

    // Check or change configuration syntax  
    std::string getDelimiter() const { return delimiter_; }  
    std::string getComment() const { return comment_; }  
    std::string setDelimiter( const std::string& in_s )  
    { std::string old = delimiter_;  delimiter_ = in_s;  return old; }    
    std::string setComment( const std::string& in_s )  
    { std::string old = comment_;  comment_ =  in_s;  return old; }  
  
    // Write or read configuration  
    friend std::ostream& operator<<( std::ostream& os, const Config& cf );  
    friend std::istream& operator>>( std::istream& is, Config& cf );  
  
protected:  
    template<class T> static std::string T_as_string( const T& t );  
    template<class T> static T string_as_T( const std::string& s );  
    static void trim( std::string& inout_s );  
  
  
    // Exception types  
public:  
    struct File_not_found {  
        std::string filename;  
        File_not_found( const std::string& filename_ = std::string() )  
            : filename(filename_) {} 
    };  
    struct Key_not_found {  // thrown only by T read(key) variant of read()  
        std::string key;  
        Key_not_found( const std::string& key_ = std::string() )  
            : key(key_) {} 
    };  
};



/* static */  
template<class T>  
std::string Config::T_as_string( const T& t )  
{  
    // Convert from a T to a string  
    // Type T must support << operator  
    std::ostringstream ost;  
    ost << t;  
    return ost.str();  
}  
  
  
/* static */  
template<class T>  
T Config::string_as_T( const std::string& s )  
{  
    // Convert from a string to a T  
    // Type T must support >> operator  
    T t;  
    std::istringstream ist(s);  
    ist >> t;  
    return t;  
}  
  
  
/* static */  
template<>  
inline std::string Config::string_as_T<std::string>( const std::string& s )  
{  
    // Convert from a string to a string  
    // In other words, do nothing  
    return s;  
}  
  
  
/* static */  
template<>  
inline bool Config::string_as_T<bool>( const std::string& s )  
{  
    // Convert from a string to a bool  
    // Interpret "false", "F", "no", "n", "0" as false  
    // Interpret "true", "T", "yes", "y", "1", "-1", or anything else as true  
    bool b = true;  
    std::string sup = s;  
    for( std::string::iterator p = sup.begin(); p != sup.end(); ++p )  
        *p = toupper(*p);  // make string all caps  
    if( sup==std::string("FALSE") || sup==std::string("F") ||  
        sup==std::string("NO") || sup==std::string("N") ||  
        sup==std::string("0") || sup==std::string("NONE") )  
        b = false;  
    return b;  
}  
  
  
template<class T>  
T Config::read( const std::string& key ) const  
{  
    // Read the value corresponding to key  
    mapCI p = contents_.find(key);  
    if( p == contents_.end() ) throw Key_not_found(key);  
    return string_as_T<T>( p->second );  
}  
  
  
template<class T>  
T Config::read( const std::string& key, const T& value ) const  
{  
    // Return the value corresponding to key or given default value  
    // if key is not found  
    mapCI p = contents_.find(key);  
    if( p == contents_.end() ) return value;  
    return string_as_T<T>( p->second );  
}  
  
  
template<class T>  
bool Config::isReadInto( T& var, const std::string& key ) const  
{  
    // Get the value corresponding to key and store in var  
    // Return true if key is found  
    // Otherwise leave var untouched  
    mapCI p = contents_.find(key);  
    bool found = ( p != contents_.end() );  
    if( found ) var = string_as_T<T>( p->second );  
    return found;  
}  
  
  
template<class T>  
bool Config::isReadInto( T& var, const std::string& key, const T& value ) const  
{  
    // Get the value corresponding to key and store in var  
    // Return true if key is found  
    // Otherwise set var to given default  
    mapCI p = contents_.find(key);  
    bool found = ( p != contents_.end() );  
    if( found )  
        var = string_as_T<T>( p->second );  
    else  
        var = value;  
    return found;  
}  
  
  
template<class T>  
void Config::add( const std::string& in_key, const T& value )  
{  
    // Add a key with given value  
    std::string v = T_as_string( value );  
    std::string key=in_key;  
    trim(key);  
    trim(v);  
    contents_[key] = v;  
    return;  
}  

GLOBAL_NAMESPACE_END

#endif//ZCONFIG_H_